Apparatus for producing finned cylinder barrels



June-9, 1942. A. w. GAY- 2,235,312

APPARATUS1FOR PRODUCING FINNEDCYLINDER BARRELS I Filed Feb. 28, 1941 e'sneets-sheet 1 INVENTOR.

ATTORNEY.

A. W. GAY

June 9, 1942.

APPARATUS FOR PRODUCING FINNED' CYLINDER BARREL Filed Feb 28, 1941 I 2 Sheets-Sheet 2 INVENTOR. I Aer/me 14 6A) ATTORNEY.

Patented June 9, 1942 APPARATUS FOR PRODUCING FINNED CYLINDER BARRELS Arthur W. Gay, Akron, Ohio Application February 28, 1941, Serial No. 381,011

7 Claims.

This invention relates to die casting and more particularlyto apparatus suitable for use in finning cylinder barrels of air-cooled internal combustion engines, in accordance with my improved process and invention.

The principal object of my invention is to provide apparatus for use in securing preformed cooling fins to the exterior surface of cylinder barrels of air-cooled internal combustion engines, as disclosed and claimed in my co-pending application, Serial No, 362,580, filed October 24, 1940.

It is another object of my invention to provide apparatus including a mold suitable for casting a metal sleeve about a portion of the exterior wall of a cylinder barrel for securing preformed fins to the Wall of the cylinder barreL,

It is still another object of my invention to provide apparatus for maintaining preformed fins in a predeterminedposition with respect to the exterior wall of a cylinder barrel during the casting of a muff thereabout.

Other objects and advantageous features of the invention, not at this time more particularly enumerated, will become more apparent as the nature of the invention is better understood from the following detailed description taken in conjunction with the accompanying drawings,

wherein:

Figure 1 is a fragmentary side elevational view of a cylinder barrel having a plurality of preformed cooling fins secured to the exterior wall surface thereof;

Figure 2 is a sectional view taken on the line 2-2 of Figure 1;

Figure 3 is an enlarged fragmentary sectional view taken on the line 3-3 of Figure 2;

Figure 4 is a fragmentary side elevational view partly in section of apparatus constructed in accordance with the present invention;

Figure 5 is an enlarged fragmentary top plan view of the apparatus illustrated in Figure 4; Figure 6 is a sectional View taken on the line 6-6 of Figure 5, and

Figure 7 is a fragmentary sectional detail.

With reference to Figures 1 to 3, inclusive, of

tions of which are embedded and secured in a muff M, which is cast about and bonded to the exterior wall of the cylinder barrel, as disclosed in my said application. The number, size and distribution of the fins on the exterior of the barrel wall can be varied to pro-vide sufficient heat dissipating surface area to meet the desired cooling requirements of the particular cylinder barrel. Although the fin members may be made of any suitable metal having high thermal conductivity, it has been found that where the combination of lightness and rapid heat dissipation is particularly desired in the finished article, aluminum and aluminum alloys have proven to be the most desirable for the fins [3, as well as the muff 14.

mold, broadly indicated by the numeral 20, having a substantially cylindrical mold cavity therewithin which receives the cylinder barrel Ill. The mold, as will be hereinafter described, is so constructed as to receive and position the preformed ring-like fin members l3 with respect to the exterior Wall of the barrel it] during the casting of the muff I4. The mold 211 is preferably generally cylindrical in contour and consists of similarly formed quadrants, each of which includes an arcuate base segment 2| and a spaced arcuate collar segment 22, interconnected by means of vertical posts 23 and 24. The lower ends of the posts 23 and 24 seat Within spaced bores 25 formed in the base segment 2| and are maintained therein by means of pins 26 traversing the bores 25, and engaging within transverse openings through the posts 23 and 24. Similarly, the upper ends of the posts 23 and 24 extend into spaced openings 21 in the collar segment 22 in alignment with the bores 25 of the base segment 2|, and are secured therein by means of pins 28. The distance between the base segment 2| and collar segment 22 of each quadrant of the mold is such as to compensate for varying temperature conditions during the casting of the muff l4.

Between the collar segment 22 and the base segment 2! -of each quadrant, there is disposed in stacked relation a plurality of arcuate spacers 30 having notched corners 31 which fit about the posts Hand 24. The spacers 39 are freely movable along the posts 23 and 24, and adjacent spacers are adapted to receive therebetween the fins l3. The thickness of the spacers roughly determines the space between adjacent fins when the same are bonded to the cylinder barrel ID. The collar segment 22, as above pointed out, is spaced from the base segment 2| a distance sufficiently greater than the total thickness of the fins and spacers to allow for expansion during the casting operation, and to permit the subsequent removal of the spacers upon cooling of the mold and casting. The inner edge surfaces of the spacers and the fin members together with the exterior surface of the cylinder barrel define a casting cavity 32, into which the molten aluminum is cast to form the muff I4. The inner edge portions of the fin members project into this mold cavity so that when the muff has been cast, the edge portions of the fins are completely embedded within the muff. The base quadrants 25 are provided with downwardly, outwardly inclined inner surfaces 34, and when the quadrants are assembled about the barrel these surfaces cooperate with the adjacent barrel wall to define a ring gate 33 which serves to direct the molten metal into the casting cavity 32. The base segments 2! are maintained in assembled relation by an upstanding peripheral flange .31 formed on the upper surface of a gate casting 35. The flange 31 is received within a peripheral cut away portion in the segments 2|. Similarly, for maintaining the collar segments .22 in proper assembled relation, there is provided the collar ring 42 formed with down turned flange 43 which engages the periphery of the assembled mold segments. Plates id are suitably welded to the posts 23 and 24 and are provided with openings W through which may be inserted a rod to facilitate in the removing of the mold quadrants from the barrel following the casting operation.

Gate casting 35 is provided with a cup-shaped interior surface 38 forming a continuation of the surface 34 and terminating in a central opening or port 39, extending through the base thereof. Mounted within the member 35 is a closure member 46 with its outer surface spaced from the surface 38 and cooperating therewith to form a runner for conveying molten metal from the port 39 to the ring gate 33. The closure member 45 is maintained in proper registered position with respect to the lower end of the barrel by means of a flange 49 formed thereon and seated within the interior of the barrel, and a bolt 4'! which extends downwardly through the interior of the barrel and is threaded into the member .5. The upper end of the bolt 41 extends between spaced frame members traversing the end of the barrel and receives the adjusting nut For clamping the unit together. there are provided hook members 52, the lower ends of which are adapted to engage the bottom of the gate member 35 and the upper ends are threaded to receive tightening nuts 53 which engage plates 54 extending across the extremities of the frame members 59. By means of the hooks 52, the assembled mold 20 and the gate casting 35 are clamped against the hold down flange ll formed on the barrel M.

In casting a muff the assembled mold is supported on a suitable frame 55. The opening 39 in the gate casting 35 is positioned to receive the upper end of a conduit 60 leading from the bottom of a ladle 6| normally filled with molten metal, at a predetermined casting temperature. The molten metal is conveyed from the ladle Bl by means of gas pressure exerted on the surface of the molten metal. Gas under pressure is introduced into the ladle through a connection 62 which is connected to a suitable source of supply by means of a conduit 63.

In using the hereinabove described apparatus for attaching preformed cooling fins to the exterior surface of a cylinder barrel in accordance with the method disclosed in my said application, the quadrants of the mold 20 are assembled together with ring-like fin members disposed between adjacent spacer members. The assembled quadrants are placed upon the upper surface of the gate casting 35 in such a manner as to be maintained in assembled relation by the upwardly extending flange 31. The collar ring 42 is then placed upon the collar segments 22, with the flange 43 thereof engaging the periphery of the segments to maintain the same in assembled position.

A barrel in which has had a portion of its exterior wall previously treated with a metallic coating and the remaining portions thereof provided with a suitable masking material, is provided with a closure member 46. The member 45 is maintained in proper position by means of a bolt 41 extending from the closure member to the frame members 50 traversing the opposite end of the barrel. When the closure member is so positioned, the treated barrel in is inserted into the cavity of the mold 20 with the .hold down flange l I of the barrel resting upon the upper surface of the collar segments 22 and within the collar ring 42. When thus assembled, the fins which are carried by the mold 20 are properly positioned with respect to the previously treated portion of the exterior wall of the barrel. The hook members 52 are then positioned to clamp the parts of the mold together and maintain the same in fixed position relative to the barrel wall. The assembled mold and barrel are then ready for casting. However, before casting the assembly is placed in a heating furnace where it is heated to a predetermined temperature. When so heated, the fins and spacers expand to completely fill the space between the segments 2| and 22 of the mold. When removed from the furnace, the mold is ready to be cast and is then operatively positioned with respect to the casting ladle '6 l Having thus described my invention so that those skilled in the art may understand and practice the same, What I desire to obtain by Letters Patent is defined in the appended claims.

What I claim is:

1. In apparatus of the class described the combination with a vertically disposed cylinder barrel of a permanent mold adapted to position preformed ring-like fin members along a portion of the exterior wall of the cylinder barrel, said mold comprising spaced upper and lower mold members, means for maintaining said mold members in predetermined spaced relation, a plurality of stacked spacer members relatively movable between said mold members along said spacing means and defining a cylindrical casting cavity about said barrel, said spacer members serving to support therebetween fin members with the inner edge portions thereof extending into said casting cavity, and a ring gate defined by the barrel wall and the inner wall of the lower mold member serving to direct molten metal into said casting cavity.

2. In apparatus of the class described the combination with a vertically disposed cylinder barrel of a permanent mold adapted to position preformed ring-like fin members along a portion of the exterior wall of the cylinder barrel, said mold comprising spaced upper and lower mold members, means for maintaining said mold members in predetermined spaced relation, a plurality of spacer members relatively movable between said mold members along said spacing means with the inner edge surfaces thereof defining a cylindrical casting cavity about said barrel, said spacer members serving to support therebetween fin members having the inner edge portions thereof extending into said casting cavity, means for directing molten metal into said casting cavity said means comprising a ring gate defined by the barrel wall and the inner wall of the lower mold member, and a bellshaped runner for feeding metal to said gate.

3. In apparatus of the class described the combination with a vertically disposed cylinder barrel of a permanent mold adapted to position preformed fin members along a portion of the exterior wall of the cylinder barrel, said mold comprising spaced upper and lower mold members formed of a plurality of segments, means for maintaining said mold members in predetermined spaced relation, a plurality of stacked spacer members relatively movable between said mold members along said spacing means and defining a cylindrical casting cavity about said barrel, said spacer members serving to support therebetween ring-like fin members with the inner edge portions thereof extending into said casting cavity, and means including a ring gate for directing molten metal upwardly into said casting cavity whereby the metal is caused to progressively fill said cavity from the bottom thereof.

4. Apparatus of the class described for casting a sleeve about a vertically disposed cylinder barrel, comprising a segmental mold adapted to position preformed fin members along the exterior wall of said barrel each including spaced upper and lower mold members, means for maintaining said mold members in predetermined spaced relation, a plurality of relatively movable arcuate spacer members and ring-like fin members mounted in alternate stacked relation substantially filling the space between said mold members and defining a cylindrical casting cavity about said barrel with the inner edge portions of the fin members extending into said casting cavity, and means including a ring-gate formed in the lower mold member for directing molten metal upwardly into said cavity.

5. In apparatus of the class described the combination with a vertically disposed cylinder barrel of a permanent mold adapted to position preformed fin members along the exterior wall of the cylinder barrel, said mold made of a plurality of segments adapted to be assembled about said barrel, each segment including upper and lower spaced mold members and means for maintaining the members in fixed spaced relation, a plurality of arcuate supporting members mounted intermediate the mold members of each of said mold segments and serving to define a cylindrical casting cavity about the cylinder barrel, said supporting members adapted to support and position a plurality of ring-like fin members with the inner edge portions thereof extending into said casting cavity.

6. In apparatus of the class described the combination with a vertically disposed cylinder barrel of a permanent mold adapted to position preformed fin members along a portion of the exterior wall of the cylinder barrel, said mold made of a plurality of segments adapted to be assembled about said barrel, each segment including upper and lower mold members maintained in fixed spaced relation, a plurality of arcuate supporting members movably mounted intermediate the upper and lower mold members of each of said mold segments and serving to define a cylindrical casting cavity about the cylinder barrel, said supporting members adapted to support and position a plurality of ring-like fin members with the inner edge portions thereof extending into said casting cavity, and means including a ring-gate formed by said lower mold members the barrel wall for directing molden metal upwardly into said casting cavity.

7. In apparatus of the class described the combination with a vertically disposed cylinder barrel of a permanent mold adapted to position preformed fin members along a portion of the exterior wall of the cylinder barrel, said mold made of a plurality of segments adapted to be assembled about said barrel, each segment including upper and lower mold members maintained in fixed spaced relation, a plurality of arcuate supporting members movably mounted intermediate the upper and lower mold members of each of said mold segments and serving to define a cylindrical casting cavity about the cylinder barrel, said supporting members adapted to support and position a plurality of ring-like fin members with the inner edge portions thereof extending into said casting cavity, means including a ring-gate formed in said lower mold members for directing molten metal upwardly into said casting cavity, a closure member for the lower end of said cylinder barrel; and a cup-shaped member associated with said mold and cooperating with said closure member to form a bell-shaped runner for said ring-gate.

ARTHUR W. GAY. 

